[0.66] Backport a few of 10.15+ changes to 0.66 stable - #1030

[0.66] Backport a few of 10.15+ changes to 0.66 stable#1030

Saad Najmi (Saadnajmi) merged 5 commits into

microsoft:0.66-stablemicrosoft/react-native-macos:0.66-stablefrom

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